''I thought another surfer had grabbed me and was trying to stop me getting the wave,'' the 34-year-old says. ''Then in a split second it all changed and something really powerful and massive dragged me straight under and started shaking me around.

Advertisement

''It bit straight through the wrist but the way it latched on it couldn't bite through the elbow. It shook and it shook and it couldn't get through so then it let go.''

After an estimated seven or eight seconds underwater, Orgias was released and popped to the surface. Scrambling on to his board, he saw the sea turning red. His left hand was dangling by a piece of skin. As he paddled frantically back to shore, he kept thinking about his pregnant wife. When he finally reached the sand, two surfers applied a makeshift tourniquet.

Later, as his condition stabilised in hospital, Orgias befriended a navy diver who had been attacked by a bull shark in Sydney Harbour a day earlier. Ultimately, Orgias lost his hand, whereas Paul de Gelder lost his arm and a leg.

''The great white is probably the best kind of shark to be attacked by,'' Orgias says. ''They do one of two things: they bite and test, which is what happened to me, or they just decide they're going to eat you and they swallow you whole. Bull sharks are more aggressive. They'll bite something and then just because it's injured they'll go it again.''

In coast-loving Australia, the shark occupies a special place in the collective psyche. A scary monster for adults, it's a creature from the depths of prehistory and our own unconscious, a dark shadow with dead eyes and razor teeth.

''As humans, we do not view it as acceptable to be eaten alive,'' says Dr William Figueira, a keen diver and marine biologist at the University of Sydney. ''And we're just very vulnerable in that realm [the sea].''

The surprise is how rarely sharks attack. According to the Australian Shark Attack File compiled at Taronga Zoo, there have been 24 recorded Australian fatalities due to shark attacks in the past 20 years. There has been, on average, one fatal attack a year since 1791.

Not that the figures have been stable. In the 1930s, with Aussies starting to embrace beach culture, 38 people were killed by sharks. In response, shark nets - or ''shark meshing'' - were introduced in NSW in 1937. The meshing is still there, put in place each year from September to April. Costing the State Government $830,000 annually, the nets catch an average of 140 sharks a year - not to mention the turtles, rays and dugongs.

Since 1937 there has been only one fatality at a meshed NSW beach, Newcastle's Merewether in 1951. In Sydney Harbour the last fatality occurred in 1963, while the most recent NSW death was at an unmeshed Ballina beach in 2008. And for every fatal attack, there are two non-fatal attacks. Of those attacked by a shark, about 70 per cent survive.

A marine ecologist at Macquarie University, Dr Iain Field, says the slim chances of being attacked by a shark can be further reduced by choosing when and where you swim.

''I don't go out into the water at dawn or dusk if it's a really grey day,'' Field says. ''I don't go out at cloudy river mouths and I tend not to go where there are great schools of fish.''

As Amy Wilkes from Sydney Aquarium says: ''If you see schools of fish behaving erratically it could possibly indicate the presence of a shark in the water. The safest option is to calmly exit the water.''

Many shark attacks are cases of mistaken identity. ''Being the cleaners of the sea, sharks take the infirm,'' Field says. ''And a surfer splashing about on the surface can indicate an animal in distress.

''The other time attacks can occur is when sharks are being territorial. Sharks can have distinct home ranges, whether there's a resource there or it's babies they're protecting, that's when they attack to defend themselves.''

Australia has an amazing abundance of shark species, Field says, but we have detailed biological information for only about 10 per cent of them.

''We are still discovering new species and new subspecies,'' he says.

Numbers are hard to gauge but Field says there is compelling evidence the populations of most species are in decline.

In recent years, dramatic innovations in shark repulsion include the Shark Shield, which creates an electromagnetic field around the user. Some universities have made them mandatory for underwater researchers. In the future, such technology could potentially be used to create electromagnetic shields around beaches.

At Bondi in February, Orgias never saw the shark that attacked him. He survived, he says, because of his pregnant wife.

''She's the reason I got in to shore,'' he says. ''The whole time I was thinking about her and not wanting her to have to go through having a baby by herself.''

Orgias and I are having lunch in a CBD courtyard full of pin-striped predators. In between mouthfuls of chicken schnitzel, he shows me his prosthetic left hand. It's the same type of hand that de Gelder now has.

''My arm comes to there,'' he says, pointing to his forearm. ''It's got these little electrodes. I can open and close the hand and move the thumb around. It's like having 25 per cent of your hand.''

Orgias doesn't want notoriety. He gives interviews to promote the blood service that saved his life. ''I don't support the culling of sharks,'' he says. ''I support clean oceans and good ocean management and that means helping shark populations. It's up to people to be aware of the risks. The one thing that I promote is the blood service. When you get attacked by a shark, what you need is blood.''

All in all, it's been a big year. In July, his daughter, Bronte, was born. ''I'm so happy to be alive,'' he says. ''The shark attack was horrendous but it's been a great year.''

And, like de Gelder, Orgias is surfing again. He gets out into the line-up as often as he can at Bondi or Maroubra.

''I knew I'd be able to force myself into the water,'' he says. ''What worried me the most was that I wouldn't enjoy it. But I had fun. And sure, I worry about sharks. I just acknowledge it and say, 'Right, I've got a fear but I've also got the ability to go out there and enjoy myself.' I have no grudge against sharks.''